Brendy -- those are some great resource links you've provided.

Here's my list just for fun:

ard / hill, height / Ardagh, Ardmore
áth / ford / Adare, Athenry, Athlone
baile, bally / town, townland / Ballydehob, Ballina, Ballinlough
beag, beg / small / Beginish
cathair / city / Cahir
carraig, carrick / a rock / Carrick, Carrickfergus, Carrickmacross
caiseal / circular fort / Cashel
caisleán / castle (caiseal is used for a castle or rook when playing chess) / Caisleán an Bharraigh (Castlebar)
cloigín / little bell, a small cluster (cloigín tithe - cluster of houses) / Clogheen
cluain / meadow / Clones, Clonmel, Clontarf, Clontibret
ceathrú / quarter / Curragh, Carracloghy, Carrowcloghan
cruach / rounded hill / Croaghbeg, Croaghpatrick
doire / oak wood, grove / Derry, Derrycarna, Derrygarriv
droim, druim / ridge, hillock / Drumfin, Dromkeen, Drumanoo, Drumcondra
dún / fort, promontory / Doneraile, Dundrum, Dunloe, Dunmanway
glas, glaisín / small river, stream / Glasagh, Glasheencoombaun
gleann / glen, valley / Glendalough, Glenealy, Glenroe
inis / island, water meadow / Ennis, Inch, Inistioge, Lahinch
cill, kill / church / Kilmactranny, Killarney, Kildare
cnoc, knock / hill / Knock, Knockroe, Knocktopher
lios / ring fort / Lismore, Listowel
loch, lough / a lake / Lough, Loughbeg, Loughrea
mór / large / Ardmore
abhainn / river
ráth / circular fort, earth mound / Raheen, Raheny, Rathkeale, Rathmore
ros / wood, headland / New Ross, Roscommon, Roscrea
sliabh / mountain / Slievenamon, Slievenamuck, Slieveroe
trá / beach, strand / Tralee, Tramore